Improved speed sensor filter

Excluding bounces that are incoherent, if the resulting acceleration
would exceed 10m/s/s

ESP32/src/vehicle-monitor.cpp

@@ -69,7 +69,11 @@ void IRAM_ATTR onSpeedSensorChange(bool newState)
 		if(impulseDuration > 500) return; // impulse was too long, ignore it (maybe magnet stopped near the sensor)
 
 		unsigned long timeSinceLastImpulse = utils::elapsed(speedSensorLastImpulseTime, now);
-		if(timeSinceLastImpulse < 30)
+
+		// TODO: find a simple formula that works for any wheel diameter and number of magnets
+		unsigned long minInterval = speedSensorLastImpulseInterval == (unsigned long)-1 ? 200 : std::min((unsigned long)200, (unsigned long)30 + speedSensorLastImpulseInterval / 2);
+
+		if(timeSinceLastImpulse < minInterval)
 		{
 			// too little time between impulses, probably some bouncing, ignore it
 		}